Loooong evolution

I have an Idea, which most likely has already been discussed... But, I was thinking how long will each stage be? Cause, I hope is really long because I was dissapointed on how fast spore was on its stages. I was able to finish the cell stage in like 20 minutes, and the creature in about 60.

An idea for the aware stage is that it keeps going even after to quit the game. Or you can have an option for that.

For instance, you have small winged creatures. And so you have to go on vacation, but you leave a switch or something on for the game to keep going. And after about a week, you can see the creature is starting to grow small feet. This seems like a nice idea. Anyone agree? And if you switch that off, and when you come back. It'll be as how you left it.